What's Difference between ApplicationServices & ApplicationServices.Core

[Amremad]

Hi All 

What's Difference between :

1. Autodesk.AutoCAD.ApplicationServices

2. Autodesk.AutoCAD.ApplicationServices.Core 

i think they have the same method ?

[norman.yuan]

They are "namespace", not class (thus, do not have "method").

"namespace" is for organising classes. It is a bit similar to File Path with File Name: you may have 2 files with the same file name, but the contents could be different. You cannot place the 2 files in the same folder (path), instead, you place them in different folders, and refer to them with different full path/file name, when you somehow need to deal with both at the same time.

[Amremad]

sorry i missed . yes they are namespaces 

but my question is :

what's the different  between the next two line 

Document document1 =  Autodesk.AutoCAD.ApplicationServices.Core.Application.DocumentManager.MdiActiveDocument;
Document document2 = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument;

both two give me the Active Document

[norman.yuan · Accepted solution]

Well, Autodesk.AutoCAD.Application.ApplicationServices.Application inherits Autodesk.AutoCAD.ApplicationServices.Core.Application.

Since ...ApplicationServices.Core.Application has the property "DocumentManager", thus ...ApplicationServices.Application automatically has the same property. Therefore,

...ApplicationServices.Core.Application.DocumentManager and ApplicationServices.Application.DocumentManager point to the same DocumentCollection object.

[_gile · Accepted solution]

Hi

The Autodesk.AutoCAD.ApplicationServices.Application class is derived from Autodesk.AutoCAD.ApplicationServices.Core.Application one.

You can see this in Visual Studio:

or in ILSpy:

Norman was faster...